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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e47eef874c04bb1daed7423a5142291bf7d71ab2b812af2fa0280947076fe46f' 
  AND token = 'wxM9FmfCxcsfVw3nOI58rYjLVQTzAe7U0gdCCw0k+AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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