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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '982540b1fb7a979664f8b28a59ae60fbd6014d988b2ddaea13d7c196c2239250' 
  AND token = '7BVaW2x8Bh7Grq2OXjMCH2AfeT8BqS595qwBHFZRZAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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