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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '88adc5d0bcd9ec2d2bbf5cd08a0971e0fecf1315f71d0649910ee145d0829196' 
  AND token = '9n/eurEHPfbknzU1Wqaxz1/tjstm0X1ByBjiLxl+uc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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