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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '70c98676f812571532a7dcb2479e26be3fa4d65616808b81a6747e0379197325' 
  AND token = 'dVsp/iRtXg9/gOzJ224bd+2m9Pu6z2uJ/j1DucSdHCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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