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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c19a849ab5cf3d6344823ed5e26713b12740a02ee66d02030d5579647ca9767' 
  AND token = 'gnhlPOBf04MA37qx+50kALF5Tj16QX59eH1MJ1YV+mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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