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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd56b43eca5f5c045404f232cb1b5b4287d55feb99f8e729783c274ec45ee04e' 
  AND token = 'gmK70m/ucJAVSa3th0wiNSueXr51SFoirmvX/jcYTwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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