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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d2ad6044307a14fa7022be33d275991878ca7f8760d008bc51a64d688497f3d' 
  AND token = 'AYoXmziYhB6iArCiNmaE4I3ZNTsHbn2ykwcy0aMR+C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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