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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0a4b376c2f6d3d9856251de29e1e9dc62681478b6ebb4c30eb7028c21b376f2' 
  AND token = '2bUnEsNix+PCY05uQccox3S2viuIW1Eeg/p2JPNP1e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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