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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dcd28a0197f09eae78e9d6f0ba9b7bbfed145e40c487894e41c2a8087d59e804' 
  AND token = 'ulExbcMTjqMV5/LH+DkBKimyYRghdwo1+CacvHfzA9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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