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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '305affb70c2d83b3bfab33d97d805e35b825f74851b0b2f9279a59a0eb0f458f' 
  AND token = 'pBCTgCuQ7qsgYf51k2z76uqTCkune7SRpOot5HvejhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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