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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '496e787bc9def98125012f9ef48e8c43c9174148a6096d93714ed23b573b4bf5' 
  AND token = 'UbgfFAfGZTo+kJ6ehTIfDyqede3Qmf8gpuHEk8NkmiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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