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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '830edb52504735cc43eb5e05ad61859fbc43799fa0fd1e0b0ff4870dc6574b51' 
  AND token = 'SDAkCUmUm6XlWJ4EMljxwpMGKQ/Tt/ea4NtbDa/CkOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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