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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '54969534b8864d4194d4ecad520c294cb45608ec0173a00565bcf22cb9d802f5' 
  AND token = 'CtJCcJ3CUH1n24mmis6pzOqCcYYH7gvu+cmJO4/H+/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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