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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f29ea4817c97f9a31279bc3b05cc26e4cec5927deb70d5bf00f43faf0bd6f4ff' 
  AND token = '1K/UAhvPehSikydDkm1t4g0voE2xH4NwJNO8Llqrmnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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