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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c54f5491688eed14cf710bba6fde97210c7e75352715d97e7427e4a65db04e02' 
  AND token = '5eUg3Iv0NLe40nbM1mjSDPt+We0u+50tNzAAteC7Rco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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