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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '11751a2347a0e09fee9489e05f4fd4bdfedcca03c87f92ac0eee112a0ce712b9' 
  AND token = '81Mo7L5ZdFtXaVkqkFyjHmAaa6U8HDNJuVW2BH00DFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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