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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dbbb9f9d6e2ecf13825e68b8070e6d3eb3ad9d6011f5e7d2911ecb5c20ddbe4f' 
  AND token = 'XKKZMKWHlp9Hh2punPrSQZwDOV7+A1bY5rF1voLepkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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