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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c1adc101930fae4383dfc407993b494132fc84c0272f879b6b0c7d421b31c265' 
  AND token = 'zmjEnV22FppptQSXCvIMM71gMeu3YtBbXt1+CbEn0p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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