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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a8ee7e00eca9536a1705f7294100f88e856b22c2115d49c8c0bd02080049a2e' 
  AND token = 'nNnmZetTn2tePQ+BEHwEyy/YYRnARFba5TLO2oneuD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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