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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ed77b0669ca243bec04a1c8c502cf960f7ec21eab9e988135328b9a0c135a037' 
  AND token = 'gzS0Ky3g3bvHeirZpv4wKtGKPvx5ok8MegMP0mDiyWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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