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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1fc78ac1b304c5e2da2df7ac05bfe6fd1aace42bc11766169187bcd7195c4a52' 
  AND token = '7ocSRpIprIoF5jh9SNul7j0sGC64AiOJqGji/5pI5K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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