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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a67f7d089c5f82921ba843b132affad42c3f233b4f20cf451a5435f7a90bc0d' 
  AND token = 'Y3oYSjJNde+WiBPbJr/CdAWidqhd8OoWKnb63Un6ftU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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