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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '438bdedc89662e5f23fe9019d61e0039436a20f0f288f1c3d82e73e0692053b6' 
  AND token = '+PDKNMVCPxgDDXElWiuMamoVMDeZGG1AX4PbRrf4XT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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