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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '91e293a4fbddf7e7d36a57ba7a240c7761d7a9bb8e01c67db1de1c37aa300cd1' 
  AND token = 'MFMKbdMUvg9zEa8YZsiFg9Uc3WNffNjSQvs+k7Pzw9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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