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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2f473fa32afc2e04be59c814e093d5c218a98ae9bb3d71b58f2fd95f1d6775c2' 
  AND token = 'eijdxjFO8fdUWzTOyMJbqsFHb1D1ULcCpFzFBZPlDOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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