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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05476bc2186d26794caa8f418215b64d9a0087a21282668deb1c5872b6f461f3' 
  AND token = 'zaTfMeRAPJo2rfq6JiFJn8Lx+go/kzfbrefGkJ5R8qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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