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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '90ef09fd7c532681835b22c6b24931629fc947dec217883c275355592b51deb5' 
  AND token = 'FVqezFgNd0YtRQm3ON115TWvRXolkVzf1tn2tRvLZ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}