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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d9d78058d259ce2cf2b2e707590d1c69c4e0f4c8e7606b7b8f1c578f966b97d' 
  AND token = 'NIDju770JLDtYcCBfNhi+GBNQeFSDH/RRgi2ARMKeR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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