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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e14cdf772f663381f5d087e01bc2bb2305b6cf80d45235ae1d37b5816328d796' 
  AND token = '07xyFmA8CsZFkHWjEr63efwm6IJw4szvP1gu1yinPoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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